Cosmetic tweaks to main kubeadm doc
Cosmetic tweaks to main kubeadm doc

- clean-up the reset script
- remove details tag

rata/kubernetes.github.io,rata/kubernetes.github.io,erictune/erictune.github.io,erictune/erictune.github.io,rata/kubernetes.github.io,erictune/erictune.github.io,erictune/erictune.github.io,rata/kubernetes.github.io,erictune/erictune.github.io,rata/kubernetes.github.io